Depends on how you view a keyboard, if you view a mechanical keyboard as a mere tool, yes. Additionally, no matter how well a keyboard is assembled, there are small flaws in the assembly, if you assemble it yourself, you can make sure each switch is perfectly seated before soldering them in. Additionally, most people prefer mechs as you can replace switches, keycaps, stabilisers when issues occur, so if you build your keyboard yourself now, you can more easily fix it in the future